26d Closely surround half navy (5, two words) ?ETI? 36d Plunge into sea on the Riviera with goddess (5) M?RG?
(I want this last to be merge: mer = sea; g = goddess, but can't work out where the other 'e' comes from; or: R = Riviera g = goddess and then I'm stuck trying to find the sea; and I still can't work out merge = plunge)